If my over-use of str2num has in any way caused offense, I hereby beg leave to apologize.
My hat's off to you for such a solution. I'm baffled as to how to decode it (pun intended). I know that there has been a lot of furor over the use of regexp and other string-based functions, conversions, etc. to lower solution sizes for problems in general, but this problem is string-based, so I see no problem in solving it via arcane string methods.
High school cafeteria
Matrix indexing with two vectors of indices
Make a run-length companion vector
Create logical matrix with a specific row and column sums
Area of an Isoceles Triangle
Musical Note Interval 1 - Diatonic Scale
Calculator spelling - Numbers to Letters
Cycling — Critical Power
Evened up (or not)
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